Hydraulic lifting device for trucks



D; H. CRISE HYDRAULIC LIFTING DEVICE FOR TRUCKS Feb. 6, 1951 2 Sheets-Sheet 1 Filed Aug s, 1949 INVENTOR. .Dm m H (YR/3E Feb. 6, 1951 ,D. H. CRISE HYDRAULIC LIFTING DEVICE FOR TRUCKS- 2 Sheets-Sheet 2 Filed Aug. 8, 1949 INVENTOR. flay/.0 /7 09/35 BY Patented Feb. 6, 1951 HYDRAULIC LIFTING DEVICE FOR TRUCKS David H. Crise, Miami, Fla., assignor of ten per cent to J. B. Forbes, Miami, Fla.

Application April 8, 1949, Serial No. 86,330

\ 3 Claims. (01. 214-75) This invention relates to hydraulic lifting devices, and more particularly to a hydraulic lifting device adapted for use with motor vehicles.

The principal object of this invention isto provide a hydraulic lifting device for mounting on the frame of a truck adjacent the loading platform thereof, and which is efiiciently and easily operated to load and unload the truck.

' Another object of this invention is to provide a hydraulic lifting device which is designed to lift a piece of work from a ground level position to a level adjacent the loading platform of the truck, and then to shift the work onto the platform.

A further object of this invention is toprovicle a hydraulic lifting device which is simply and cheaply manufactured, and which is easily adapted to all makes of trucks and motor vehicles.

Other and further objects and advantages will become apparent from the following claims and detailed description of the drawing, forming a part of this specification, and in which drawing Figure l is a side elevational view of the device of this invention, with the device mounted on the rear of a conventional pick-up truck and illustrating a piece of work located on the device in its ground level loading position.

Figure 2 is a rear view of the device shown in Figure 1.

Figure 3 is a top plan view of the device shown in Figure 1.

Figure 4 is a rear elevational view of the device in its truck platform loading position. 7

Figure 5 is an elevational view in partial crosssection of the hydraulic lifting means forming a part of this invention.

Figure 6 is a fragmentary perspective view of the bracket means used to mount the lifting device on the frame of a truck. 4

In the drawing wherein like reference numeralsrefer to identical parts, the lifting device of this invention comprises a hydraulic lifting means 1 adapted to be supported on the frame of a conventional pick-up truck adjacent the loading platform thereof, a work supporting means 8 carried by the hydraulic lifting means, a bracket assembly 9 to mount the device to the truck frame, and a standard hydraulic pump l0 operatively connected to the lifting means to provide the device with pressure necessary for its operation.

The hydraulic lifting means I, as shown clearly in Figure 5, includes a vertically mounted hydraulic cylinder II, a piston l2 slidably mounted in the cylinder, and a tubular member 13 circumposing the hydraulic cylinder. The hydraulic cylinder II is preferably of a sturdy tubular construction with one end closed and the opposite en threaded to receive a bushing M. The bushing [4 together with the packing I5 form a suitable packing gland through which the piston l2 may freely reciprocate. The upper end of the piston I2 is secured to the tubular member H by means of a bolt Hi. The tubular member I3 is movable with the piston l3 and is slidable vertically and freely rotatable about the outer surface of the hydraulic cylinder H, the cylinder ll being fixedly mounted to the frame of the truck, in a manner to be subsequently described. The tubular member 13 is splitaxially at its lower end 11 for a purpose to be later disclosed. V

The lifting'means 1 is preferably mounted on the frame of the truck adjacent its tailgate l8, but free of the pivotal movement of the latter. 'A bracket assembly 9, as shown in Figs. 1 and 6, is preferably used to support the lifting means i. The assembly 9 includes a transverse channel member l9, which is suitably bolted or welded to the ends of the longitudinal channels 20 located beneath the loading platform 2| of the truck. The transverse channel member l9 may be braced by a member 22; and'is provided with a projecting bracket 23 secured to its one'end. The projecting bracket 23 is provided with a pair of embracing arms 24 in which the lower end of the hydraulic cylinder. II is secured as by welding;

The work supporting means 8, carried by the tubular member [3 of the hydraulic'lifting means 1, comprises a pair of transversebars 25, 25 at-' tached at their one end to the tubular member l3 and arranged in spaced parallel relationship. A pair of vertical bars 26, 26' are pivotally attached at their upper ends to the upper transverse bar 25 and are arranged in spaced. parallel relation. A horizontal platform 21 is secured to the lower ends of the vertical bars 26, 26' and is suitable for supporting a piece of work, such as a drum 28. A brace 34 connects'the ends of the bars 25, 25' to the top of the tubular member l3, to thereby prof vide a firm structure. The work supporting means 8, when loaded, is self-leveling due to the pivotal connection of the vertical bars 26, 26 with the transverse bar 25'.

A suitable hydraulic hand pump in is mounted on the side of the vehicle, and is capable of providing the lifting means I with sufiicient pressure to permit the efficient operation of the latter. The pump I0 is equipped with a control valve 29, an air-relief valve 30, and a handle 3|. A hose 32 connects the control valve 29 with the hydraulic cylinder II. The projecting bracket 23 is suitably apertured to permit the introduction 3 of the hose therethrough and its connection to the adjacent surface of the hydraulic cylinder I l. The tubular member I3 is free to reciprocate without interference with either hose 32 or the bracket assembly 9 due to the split lower end I"! of the former.

In operation, the device is placed in its ground level loading position, as shown in Figs. 1 and 2. In this position the work supporting means 8 is locked against rotation due to the split lower end I! of the tubular member 3 being in abutting relationship with the embracing arms 24. I a piece of work, such as a drum, has been loaded in the platform 21, the hand pump handle 3| is operated with valve 29 closed to provide the; hydraulic cylinder II with adequate pressure to lift the work to a truck platform unloading posi tion, as shown in Fig. 4. The Work supporting means 8, which is carried on the tubular member l3 m ay be then manually rotated into thetruck, as indicated by the arrow in Ffig'. 3.: The reverse operation is utilized to unload the truck; V It is to be understood that the embodiment of the invention, described, and shown the drawing, is used illustratively only, and does not necessarily define the scope of the invention which is expressed in the claims of this specifica tion'.

What I claim is: n

1. In a lifting device for mounting'o'n the frame of a truck adjacent the loading pl atform thereof, a vertical hydraulic cylinder, fixedly carried by said frame adjacent said platform, a piston slidably mounted within said cylinder, a tubular member circumposing said hydraulic cylinder and operatively secured to said piston, said tubular member being mounted for slidable vertical and rotational movement relative to said hyi draulic cylinder, work supporting means carried by said tubular member and adapted formov'e ment with the latter to assume ground level loading and truck platform loading positions, and hydraulic pressure means operatively con nected to said hydraulic cylinder.

2. In a lifting device for mounting on the frame of a truck adjacent the loading platform thereof, a vertical hydraulic cylinder, fixedly carried by said frame adjacent said platform, a

piston slidably mounted within said cylinder, a tubular member circumpcsing said hydraulic cylinder and operatively secured to said piston, said tubular member being mounted for slidable vertical and rotational movement relative to said hydraulic cylinder, work supporting means car ried by said tubular member and adapted for movement with the latter to assume groundlevl loading and truck platform wading positions, said work supporting means including a pair of transverse bars attached at their one end tosaid tubular member and arranged in spaced parallel relation, a pair of vertical bars pivotally a1;- ticfied at their u per ends to tfi upper trails- After verse bar and arranged in spaced parallel relation, a horizontal platform member secured to the lower ends of said vertical bars, said work supporting means being rotatable with said tubular member so that said platform member may be positioned within said truck when said work supporting means is in a truck platform loading position, and hydraulic pressure means operatively connected to said hydraulic cylinder.

3. In a lifting device for mounting on the frame of a truck adjacent the loading platform thereof, a vertical hydraulic cylinder, fixedly carried by said frame adjacent said platform, a piston slidably mounted within said cylinder, a tubular member circumposing said hydraulic cylinder and operatively secured to said piston, said tubular member being mounted for slidable vertical and rotational movement relative to said hydraulic cylinder, work supporting means carried by said tubular member and adapted for movement with thelatter to assume ground level loading and truck platform loading positions, said work supporting means including a pair'of transverse bars attached at their one end to said tubular member and arranged in spaced parallel relation, a pair of vertical bars pivotally attached at their upper ends to the upper transverse bar and arranged spaced parallel relation, a non: zontal platform member secured to the lower ends of said vertical bars, said work supporting means being rotatable with said tubular member so that said platform member may be positioned within said truck when said work supporting means is in a truck platform loading position, hydraulic pressure means operatively connected to said hydraulic cylinder, and means secured to said frame adjacent the rear of said truck for supporting said device, said last mentioned means comprising a transverse channel member secured to the longitudinal channel'sof said truck frame beneath said loading platform, a projecting bracket secured re rieend of said transverse channel andextending rearwardly of said tru'clji, aidh'ydraulic cylinder member being fixedly secured to said bracket. H DAVID H. 'CRI SE REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

